A Chemical Abundance Study of three RHB and two RGB stars in NGC6637 (M69)

Abstract

We present a detailed chemical abundance study of three red horizontal branch and two red giant branch stars in the metal-rich globular cluster NGC 6637 (M69). The value of [Fe/H] derived from LTE calculations is $-$0.77 $\pm$ 0.02 dex. We also discuss the anticorrelation between oxygen and sodium abundances in the program stars and compare the [Si/Ti] ratio of NGC 6637 with those of other globular clusters.

to appear in the Proceedings of the 7th Pacific Rim Conference on Stellar Astrophysics, November 1--5, 2005, Sejong University, Seoul, Korea, ASP Conference Series, 2006